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(No Model.)

G. W. KNAP'P.

MAGHINE FOR FORMING TAPER TUBES. No, 299,404.. \nk Patented May 27.18841.

WITNESSES: INVENTOR w a/z BYw.-w; 16

V ATTORNEY N. PETERS Fhniolilhognphur. Wiuh ngtom D, C,

UNITED STATES PATENT ()FFrcE.

GEORGE W. KNAPP, or BALTIMORE, MARYLAND.

MACHINE FOR'FORMING TAPER TUBES;

SPECIFICATION forming part of Letters Patent 110,299,404, dated May 27, 1884.

Application filed March 27, 1884 (No model.)

To all whom it may concern.-

Be it known that I, GEORGE W. KNAPP, a citizen of the United States, residing at Baltimore, State of Maryland, have invented certain new and useful Improvements in Machines for Forming Tapered Tubes, of which the following is a specification.

My invention relates to a machine for forming tapered sheet-metal tubes, such as the spouts attached to coffee-pots, sprinkling-pots, milk-cans, the tubes of funnels, and othervessels.

The object of the invention is to provide a machine capable of making tapered tubes of various sizes.

In the accompanying drawings, Figure 1 is a longitudinal side view of the machine. Fig. 2 is a top view of same, and Fig. 3 a front end View of same. Fig. 4 is a cross-section of the tapered mandrel. Fig. 5 is ablank of asheetmetal spout. Fig. 6 is a view of a tapered spout as it comes from the machine.

The letterA designates asolid metal block, which has a tapered bore, 1), the large end of-which is seen in Fig. 3. This bore runs through it from end to end, and gradually diminishes in size. The top of the block has a slot, 0, extending from end to end. This slot opens into the bore. On the top surface, each side of the slot, a plate,d, is secured by screws d. Near each corner of the block is a side lug or foot-piece, e, provided with a hole, 0, for the passage of a bolt, to serve for securing the machine to a stand. A mandrel, F, tapers gradually from the large endf to the small endf, which in the drawings is seen projecting from the block. The mandrel passes through the tapered bore. At the large end the mandrel is reduced in size to form awrist, g, and at the extremity the mandrel is provided with a crank, 71.. A straightgroove, 2', is in the mandrel and extends from end to end. This groove is shown in Figs. 1, 3, and 4. 111 the latter figure is also shown a broken-line central circle, which indicates the small end of the mandrel. A hand-lever, L. has one end pivoted to the rear side of the block by a bolt, 7c. The free end has a suitable handle, a, which the operator grasps. A notch, 10, opens on the under side of the lever between the handle and pivot, and is of size andshape to take over the wrist g on the mandrel. It will be seen that when the lever is raised, as in Fig. 3, its notch is released from the wrist, and then the mandrel may be drawn out of the bore; but when the lever is down, as in Fig. 2, and its notch engaged with the wrist of the mandrel,the latter is thereby retained and cannot be drawn out. \Vhen the mandrel is thus held by the lever, its position in the tapered bore is such that there is room between it and the bore for the sheet metal to be wrapped around the mandrel. An adjustable guide, R, projects over the block and across the slot 0. This guide has a slotted holder, q, adapted to slide along a raised edge, 1*, extending from end to end on the top of the block. The several holes 8 in the raised edge permit the set-screw s, which clamps the holder, to be shifted so that the holder and guide may have position near the desired .point. The slot in the holderof course permits of the guide It being adjusted along the top by simply loosening the set-screw s.

The operation of the machine is as follows: A flat, sheetmetal blank, t, has one of its straight edges placed in the slot 0, the small end of the blank at the same time abutting against the guide R, as indicated in Fig. 3.

By now turning the crank 71, the groovei in the mandrel comes around coincident with the slot 0. Thereupon the aforesaid straight edge of the blank occupying the slot will enter the groove. Continuing now to turn the crank in the direction indicated by the small arrow in Fig. 3, that edge of the blank which is in the v groove will be bent, and by said bent edge the revolving mandrel will draw the entire blank into the bore, and it will be wrapped around the mandrel, thereby shaping it into a tapered tube. The lever Lis then raised, the tapered mandrel is drawn out of the bore, and the tube is removed from the mandrel and has the shape shown in Fig. 6. The mandrel is then replaced in the bore, and the same operation may be repeated.

Having described my invention, I claim- A machine for making tapered sheet-metal tubes, having ablock with a tapered bore, and provided with a slot opening into the said bore, a tapered grooved mandrel, and a guide projecting across the slot, as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE W. KNAPP. Witnesses:

JNo. T. MADDoX, J NO. E. MoRRIs. 

